It’s interesting - because WIPs come and go at faster speeds than released games, and most of them don’t get finished, there’s an accelerated trend/inspiration cycle where people are very involved on the forum (or on Tumblr).
As well as what others have mentioned: contemporary romance/drama.
Urban fantasy/horror, fantasy in general, superheroes, and schools (magical or otherwise) are always solidly popular especially with strong relationships/romances.
The World of Darkness games are very popular, although horror lacking in player agency tends not to go down very well (and it’s therefore tricky to thread the needle of truly scary unknown horror). They’re very stat-focused and involve formalised levelling up as they’re based on the TTRPG system.
I suspect that players who aren’t interested in stats at all in these kinds of games are a minority, though a vocal one. “Stat-heavy” is in the eye of the beholder. But it’s frowned-upon for a stat failure to completely scupper a PC’s chance for success or outright kill them, especially if it’s early on.
There are some CoG style guidelines that were made public here:
They’re a bit outdated now, but they give a general sense of the way stats are usually used in CoG games (as opposed to HG or HC ones). HG ones are much less uniform, with the associated pros and cons that come with that.